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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '242bda34e66567f8260fb4810f02fc3d1ee3b09da6c356b7902cb6d25574b7ae' 
  AND token = '0hADc2/P9pwfzE3DtSySO91BFEKBxdfVjC4TpJUOINI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}